A slogan used by the motorscooter and clothing company Lambretta in their advertising.
The quote can be seen on their clothing tags, enamel signs, posters, etc; dating from around the 1960s up until the current times.
This term has been coined by Mods and Scooterboys when referring to the hobby of scootering and/or scooter culture.
Dave: "I can't believe you'd ride to work on your GP200 in this awful weather!"
John: " What can I say? It's a way of life."